why arent the flywheels race legal? and the only reason i would change the stock impeller is becasue its a big very heavy. in my x2 i run the same flywheel with a skat c75. 2.35lbs had dave work it some.
Good question... that is just what I read on here.... only for certain limited/stock class its not legal
I know swapping the SXR flywheel is much more effective than swapping an SJ one.